1. Abrial, J.-R.: The B-Book. Cambridge University Press, Cambridge (1996)
2. Ambert, F., Bouquet, F., Chemin, S., Guenaud, S., Legeard, B., Peureux, F., Utting, M., Vacelet, N.: BZ-testing-tools: A tool-set for test generation from Z and B using constraint logic programming. In: Proceedings of FATES 2002, Formal Approaches to Testing of Software, August 2002, pp. 105–120 (2002); Technical Report, INRIA
3. AT&T Labs-Research. Graphviz - open source graph drawing software, Obtainable at
http://www.research.att.com/sw/tools/graphviz/
4. B-Core (UK) Limited, Oxon, UK. B-Toolkit, On-line manual (1999), Available at
http://www.b-core.com/ONLINEDOC/Contents.html
5. Lecture Notes in Computer Science;B. Bérard,1999